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Just above the first post on a page (towards the top-right), there is a 'Thread Tools' menu with an option labeled 'Subscribe to this Thread...'
Your subscribed threads are saved and a complete list is viewable here: http://www.webdeveloper.com/forum/subscription.php (also shown under the 'Quick Links' menu near the top of the page).

To be fair, this provides the functionality you desire for topics, not individual posts.

"Given billions of tries, could a spilled bottle of ink ever fall into the words of Shakespeare?"